A strong earthquake has shaken Costa Rica, but only scattered damage and minor injuries have been reported.

The U.S. Geological survey says the quake struck around 2:00 a.m. early Saturday, and was centered about 40 kilometers south of the capital, San Jose. A Red Cross spokesman said there are reports of minor injuries. The National Emergency Commission said falling trees caused power outages in some areas.

The earthquake struck as leaders from 21 countries gathered in San Jose for the Ibero American Summit. But summit officials say none of the attendees were injured and the hotel where the meeting is taken place was not damaged.